Soluzione - Long subtraction
4,9
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | ones | . | tenths |
| 7 | , | 7 | |
| 0 | , | 7 | |
| - | 2 | , | 1 |
| , |
2. Subtract the numbers using long subtraction method
Because the upper digit (7) in the tenths column is too small to get a positive difference, borrow 1 from the digit (7) in the next number place which becomes (6) and get (17).
| Place value | ones | . | tenths |
| 6 | 17 | ||
| 7 | , | 7 | |
| 0 | , | 7 | |
| - | 2 | , | 1 |
| , |
Subtract the numbers in the tenths column from the top number:
17-7-1=9
| Place value | ones | . | tenths |
| 6 | 17 | ||
| 7 | , | 7 | |
| 0 | , | 7 | |
| - | 2 | , | 1 |
| , | 9 |
Subtract the numbers in the ones column from the top number:
6-0-2=4
| Place value | ones | . | tenths |
| 6 | 17 | ||
| 7 | , | 7 | |
| 0 | , | 7 | |
| - | 2 | , | 1 |
| 4 | , | 9 |
The solution is: 4,9
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